In the given figure of strawberry fruit, identify $\mathrm{A}$ and $\mathrm{B}$

See the following figure and identify $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$ and $\mathrm{E}$ are respectively

Assertion : Endosperm is a nutritive tissue and it is triploid.

Reason : Endosperm is formed by fusion of secondary nucleus to second male gamete. It is used by developing embryo.

Assertion: The two cotyledons in seed are embryonic leaves.

Reason: The embryo contains radicle and plumule.

A) Both assertion and reason are correct, Reason is the correct explanation of assertion.
B) Both assertion and reason are correct, Reason is not the correct explanation of assertion.
C) Assertion is correct, reason is incorrect
D) Both assertion and reason are incorrect.

Assertion : Autogamy is pollination between two flowers on the same plant.

Reason : Xenogamy is pollination between two flowers on different plants.

Most resistant biological material is  

Or

An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is

Or

Which of the following plant product is the hardest